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L
H T I
What Is Heredity?
eyebrow
Heredity is the passing of traits or characteristics shape hair color
from one generation to the next.
eyebrow
hair color
shape
eyebrow hair color ear lobe
shape earlobe
a achment
ear lobe
egg egg
sperm
sperm
Fertilization
When an egg and
sperm come together
at fertilization, the fertilized
cell
embryo receives a fertilized
cell
copy of each parent’s (zygote)
chromosomes.
DNA
Human Karyotype
DNA
1 2 3 4 5
gene gene
6 7 8 9 10 11 12
13 14 15 16 17 18
or
19 20 21 22 father mother
XX (female) XY (male)
Humans have 46 chromosomes that are The inherited genes on these
present in 23 pairs. One chromosome in each father mother
chromosomes contain DNA sequences
pair is inherited from the mother, and the that are related to particular traits. A
other from the father. person inherits two copies of each gene.
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